If i use the JSON fix, I get the error: data was not an object (parent). The parent was a "bug" issue, so this should not be a problem.
Cloning sub tasks seems to be in the backlog since 2017, is there any update on when this will be released?
The workarounds posted doesn't seem to work anymore and I'm looking for a solution to clone an issue along with sub tasks from one project to another...